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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b423467eb146164ca385ed69b5764ccf72c5fe418e820992d68508341cd1e2' 
  AND token = 'mJ6EY3djaKnxZ02l/aaCE3oNFm8bgZn3A5Fk4vB2R14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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