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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a74b355dc56d14d25e0072945143b7cae86d8aceea9cb70e5347fe04f05007' 
  AND token = 'C7kdWYOxeDe5vbHz+geJR2NAJCnKJb9+2sY+cP+gQEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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