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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfa780508e6b0203bfb0c14c7f4d464e898290b614fad247b2390a0eb962207' 
  AND token = 'pMwJzWX4wubVb7N9Uy3+5swMIbIEnx2A/7EgLsDU5BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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