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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdafdb1d601ec013bbc3e0f16af26cea44327bd28698cc843f801704c699ff7a' 
  AND token = 'Wp2Nc/kHWvGu7tKl0h0Kr91VoE1ZyVr8uAZGeBnOP38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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