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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8b046bac10ff7bebd3ff9b7cee9f9014ce06c36b73b8d5c02c305149fc7391' 
  AND token = 'Eo1J8Q0o4sOmyyHIaKP2LErQQbLaKPXJG/3vlw0xp0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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