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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11a5aeb230e259f746bcac65bd68e3f00463556cff301b1af19b2115972136c' 
  AND token = 'OwLs9R8FdTjJyoAav8swKAIc+e96I5YSNT0sJvRrTLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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