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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75cba8887d8875c1104dc35e6df2855a096294807ba885a261667007d41fa6d1' 
  AND token = '02uoDq0D4FKIo0hGGefDk34Tt1w/zURL3AYQiCoS4Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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