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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacb26ed0a618b3d4c25dde0ee3a0ffcd23793ba5a2345f3dbb9fc1c16b6f53f' 
  AND token = 's5fsWT2Fti6IJRVXVevXOquvFG81Laas7UZMkaArsWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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