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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb03f2e549cc0443f946237cce4e4c88a1ab44c99ae8687d6c19b95aa6e395b5' 
  AND token = 'z/5aADfrZyNer+s2RSuEhRSO9B/osxRh9eKBwWsgnKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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