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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0cc44f6692c225760c4ebe6d6148f1273b8a1186d68918cba6908455d5a7b0' 
  AND token = 'B0lVRCBerRKBR6n8AVkQ2x2hCLwgsZfx89V/gSy2bB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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