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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cf0bbd6038eef6882ee14587569d19b4df8b63c8afbfdad15e578ae42c1021' 
  AND token = 'Psl7in80kzgpiXig1M4Yj7kZJygPNu7Xl4KW29gPmDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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