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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7da64a972858396fac9fb56875286703f69498cc5854a7fead76d8d5d7d256' 
  AND token = '0O1Tv/8KDre+/cihDxiYbbumdcKMVz6g4fXTYm75hdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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