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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dfa57085e747e27ab78e86b5ef3745525d909c927632019e844cf2e724e2cf' 
  AND token = 'bfPhqeLZrgJZauFs3fVNRDagPMPqiDsg7iXIGePUNK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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