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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a36caeeacbce90d2d86837cf691b8362e546692d148dea39363df6ad978643' 
  AND token = 'wAc+LftO0wLCljH/sEsf6PAAQ4AX/U30oiqxDV/GqKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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