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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ad9b430e30d9904396e2229b1e31e1e680860c78a942cfa98086bb6e86f65b' 
  AND token = 'Lm15XRkBWAm7OmcOOdZyEvfmGaDH6Nn+EwQ13RK9CoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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