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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20c60a2a51f2558e27f3b9d0b08ea6db9383a5c3ab0ec91fb006d5ff1162514' 
  AND token = 'KN1+bhCd+27KSK1JCa/KwE7TsnMx0yAqvtOQ4E7yqwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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