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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7893bc6b0a0254bfd50fe25d44150abe0a38b41158187e91c89d654bb0f02d78' 
  AND token = 'sWwo4aE+5PxT34uXdeRstr2aF+PcE9d0i0kkExLtNlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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