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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c7cca8b58ed18ea97a764c30dc634f27e0223220b84691644fed97ab2eec4c' 
  AND token = '7t5fjZ6K14LBXndTf4X6fVUNSHXcD4+3KU2L3uurM/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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