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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b8d6b22edffd70e8f39fb6ff3a548a6abf4809cf242cc78072c494ccd182bd' 
  AND token = 't++lJX+D5nccO+Ory4okpuNv0dVLhtN1FiN2Px7xaDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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