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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf9bb242db48518cf940f13c47bda2291d06070e8e308d1be68ab9ea6ee564d' 
  AND token = 'F4WQIxVE3ngqLmTkuMpJKt4oHD/A+yx+l/Vw+rWWOmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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