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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66786ceed0d1dd1e1d999de93fd06fe841f492699d05aa39929ce092cd0d723c' 
  AND token = 'Zg4LV1yzslUa+syFBfaXukI04QOSb59Z+vCJJvbA4MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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