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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad527738f33859a92aea5fa27ce4f2ac79c87e27ebc86b38aedcd148f1ed2adc' 
  AND token = 'M3Exe95/+sbZ9RL8PU4ajzQROXsd0Puw9meL8jDtIL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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