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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991393d5585af648665ff269ee01bdf048efa9afcd10d0f304044bb52d1bea9d' 
  AND token = 'gRDqD019MpqODPd6s1+6UBsH5jyQ1aepnO8NMb2jUSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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