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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa62a83f23f28afd0d8d80745dadd0f0a8ca25ddad6cf4635f7f4f33cc57434' 
  AND token = 't0tok44UX4iOgEzGhJnmnLLsUij2bBRWjhHRgKYEUds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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