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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9887f026bdab0b73e0406eab4d8c237834fd2747f18de3a661347ea1c201bb2' 
  AND token = '7EcvYkjeauEcmEhA/+G6+r4ndPjPIMg3rbeyDk0tFu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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