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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd964c63e71e155ce56482f40ed4171cfbf7925764d54ca2021600baf35c7445' 
  AND token = 'XX/H8ott4JfyNPMiAOVYoO7w8f+KTA6C00LKBRfMl0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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