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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac223d4f405c6743d560d873b0ecb8c8664fde556fb653641caf21d46715ad37' 
  AND token = 'A5vTb9y0FSUua1rlcpyn2LVJmXza4zRExshXm0W5Es8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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