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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb07098d7b3ee59c8503d1b5d4c726a12e2a3d155439861c37227d45b2a7437e' 
  AND token = 'xzX36jyxJUTnDxcpNzsVX16acJ3nMwedwyK7ka4n5x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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