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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e07f3c8313d755939b10c9da770fc7819885beed9f6efefdea0eb11b1950133' 
  AND token = 'UWAcsr4wqclY+W6dzzT7LRmP5uJuvdsafQ8s0FHNITo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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