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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b3938f37d12422da992040d597b7316913136603c2a675d790368581d0f7ea' 
  AND token = 'ez70kD1Jb4JmN7sXFAkkAoPD1JLk0Vsh9EpfcOUM4Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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