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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e8abddebf71092ec9434efbb0d256e43e9690c0994e78a2d5f79622d020e854' 
  AND token = '1Us6RynC9q+9xGNEYsBOBmj2kogc2peBFV/LbX152bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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