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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02c3b5b6d85172ecae34719e04d06d36e3092e74c86c7333060b235013b9654' 
  AND token = '5xPX/v2FD+NXHi/JFBP+Rr2msNKTstanDE1dfBQmvUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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