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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5f4c55420cbe79863211850240d968b3fa3aff72bb2f68cba4fe644acd6760' 
  AND token = 'OOiqp3IboS6m1zotZt+0cQqccGk25YRJDdALvK4twXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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