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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed17ca9e88b2c061bb5a825a8f55e4d300ecf9b9a7650b6b3b21025e402834a1' 
  AND token = '4KY5Hihj0436Cdr4iXo3VodcIA7oYgE0FQnBM5TNMbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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