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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab1191d6e1d58dc62e1d898eeac302e79e2dded8bfc139363445d76096d302e' 
  AND token = 'evIb+FFuBlhpfeCAOsfxgN+txi82SBGmQWMC21C+Vlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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