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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add54b7e0d36267d091e3dc3bead8ad1af77585d33217331f26c46a466dcb3a0' 
  AND token = 'spkjLyQ1DujRHb7DyCfksspWreY0r+2J9TK4c/oLuF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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