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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7fe44f71eda7bf5fcf7628813a93bdbc8ba3c251e3277ec76f1cb7a7cda4eaf' 
  AND token = 'Ry7wuYIGXVEJ3yrWX6VdvzVZ7Hg3ZNAmUZtyDrmUriQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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