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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6018684e9c45cc9ba74c7282caae59f0a6e567956261d169ce76062414512d8' 
  AND token = 'Hy7dynkxhKr9jLlb1Q0w65Sab2XRMg2MG2iVeREssZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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