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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68151299c82e63dc65802e49f33fe0f91622cb9dbdfa7acd5a9a24882969f0e' 
  AND token = '20uAG2Hntdn1yCPhik/Dc3RRPITFK9ntqMg98OcxIQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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