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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2937ff3ae0b5eaaccac1e17e5e1327c1921dc4a1171b46c3df1d55af38a07db' 
  AND token = 'CHYK3cnwhvXyvd5bWGK8RdfhhzEhSaI1671KqH1Ev6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}