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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a7c82f84a68a8a9f84d14c9cf1d98639cc2073d18fbad4bade84354fa6dd26' 
  AND token = 'I9v8rCCIhIc5VJp25xUuZeimGTT2JymG7MvmCJAcW1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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