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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec59e2ab1451c21c64c265bc616deea4051409d0b041ded2f3c4021cd300e30a' 
  AND token = 'dG1JVta44ZXICWyOFOlcbXxDGqgO6i9JxFVHSY+vaz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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