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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14bcbfa14cdbd159352a8633054482e885578b2c73afe8a52e45974c128db1e' 
  AND token = '/IccTls06Kt4M4TsN7HVJ2gy7R1LI02luoq1GaDM2ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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