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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f8e4650fe06355590770331fed28b993acbf59cfefa5e280e2e6ab96fa15fb' 
  AND token = 'uqZFErivssqaXoa1MdTzI3+UFrzziLDR88ssfCtauNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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