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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eedc01dcea9ec1a2edd2b20503bf38d011a9e2a959429288dd646dc08905692' 
  AND token = 'hhbySGhIs6l5rjAMtyxpVsamTFBfarxdPzhJ/0NLWdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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