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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fdb7d3e0452a1956a912158cc0d516f46aa4e2efff3be8d3c7754ae053ef63' 
  AND token = '8oQ5AKzKYUSWrvloleLr6vvjComgXIlQfdXFm5x5Hc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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