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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8a2911d1468ed579148ad9435b9d73ce9271403ef6e9ac9c72a1432795d6fe' 
  AND token = '0zRlbv663XmO+rSu1aEJ8PdHOdwhEznTEs+5MzLVX2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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