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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f78a993291aa8d80ba76635c1eade1d704ca49ff370272fe0e56ac5debda52f5' 
  AND token = 'AC/sns9J8akVriZa56pTTJ6dKN3Qrljjpv9Fzr2z8fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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