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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95cea6a74f6bad5c676980db530aa4bf2505b79f73d024a84db9330f5512ba3' 
  AND token = '/cntg3w5Xk6aDXgZAb3N2tECK/pe5/kFtz+d6E0dpuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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