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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0b0c93318b1d98c43b205927fdea99a1fc402deb5de3f95c09bf71727003da' 
  AND token = 'pq8gB6yyqjapJSBLB5w2G+AgTxnimzXcnXCSHxco9J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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