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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8c166d6565cf6e4db86aaca6695944a07815e9ae78e83649e7e21960beb573' 
  AND token = '6HqlRB87BL+z3hriVwNSXFtxgAMjwfeolsjCRZrI2ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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