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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937b1167fe5b6feffdc6159bf77f33a01c2be1e57ec1cf7d1b4424d064a0fccd' 
  AND token = 'Z3/1BPzFFvs4NvP9iDoquXofdoWcvjM8cXbDtGKWDeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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