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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabad80b0dd8292af1ba1159533745d1dbedb36b14d5dd1ccafc48ac94ef0c66' 
  AND token = 'BWRpUj/kBQ3L/b1zwWnDb0UR+cEXeAQX4lhSEva6FJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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