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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd4d399381128d8ea55df7c25f3b69e6db28cb903d4d6836e1c1288abf52686' 
  AND token = 'NFLRQtdmpylsfoVYqsDa1oJwMhlSJ7xismHt1RHC09Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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