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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c351ea16748075626de1977bd41bed204ecd5c4a2665b390f65948e4a2f8a7' 
  AND token = '7Hd/VG1Tztz1mAybVbbir+kR2TZsliAojRpV3PbbgY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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