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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a5c2dcdd966edac5038ce670cd758fc4a0692046c8001d56f22826ba4662d2' 
  AND token = '5aL2aTXz3huor8RR4DfYCHBm3ZMc1pBCTG4lgzrdCeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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