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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a814469b7df4faca8f376fadd6526541488416624edf03e07e664d1467217b' 
  AND token = 'UH3VHzApViwarEMgj6+S6/rD2x1YUenPZ2EEL810U6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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