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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cd56f30ce1b7ce66392f424a19968dedbd905fea2f4c7fbe74a7528d7514fc' 
  AND token = 'dS7Nc+J7Vp2ArFOipN5o8a1Ue7wmoPkxzWA9FHH7hvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.07997

JSON explain

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